Grinding mechanism

ABSTRACT

A grinding mechanism includes a rotating body, a first grinding wheel, a second grinding wheel, a first fastening means, a second fastening means, and a spacer assembly, a first fastening means passing through the first body portion and fastening into the rotating body, a second grinding wheel including a second body portion and a second grinding portion. The first and the second grinding portions have different diameter from each other, and are spaced from each other axially, and have different grinding precisions. The spacer assembly is interposed between the first grinding wheel and the second grinding wheel. The second fastening means passes through the second body portion and the spacer assembly, and threadedly fastens into the first body portion, so as to press and secure the second body portion and the spacer assembly against and on the first body portion.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a grinding mechanism, and more particularly, to a grinding mechanism having a function of adjusting the position of grinding wheels.

2. Description of Related Art

Currently grinding facilities have been widely adopted, particularly use of grinding wheels (for example sand wheels or brush wheels) can be seen in manufacturing factories such that surfaces of ground workpieces are polished and smooth. Accordingly, grinding wheels are widely welcomed by public consumers.

For conventional sand wheels, abrasive grains in a sand wheel are approximately of the same grade. Therefore, in case people intend to proceed with a mirror grinding on workpieces, they need to perform, in sequence, a rough grinding process and then a fine grinding process so as to obtain ground workpieces as desired. In other words, respective working processes with sand wheels of abrasive grains of various grades, or with a brush wheel for a fine grinding process, are necessary. A conventional design resides in mounting dual sand wheels of different specifications on two driving devices in a grinding machine, for example, the conventional grinding machine, as shown in FIG. 1, has two sand wheels 1,2 driven, respectively, by different motors 3,4.

However, it is rather cumbersome for those who undertake the above-mentioned working processes. Even if a rough-grinding wheel and a fine-grinding wheel (or a brush wheel) use the same driving device, steps of attaching and detaching the grinding wheels/brush wheel are indispensable. In these occasions, people have to take into account of the problems such as dynamic balance, concentricity, roundness, and so forth, when attaching and detaching the grinding wheels. Taking care of these problems is of very much time consuming.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a grinding mechanism, so that on the one hand, working steps can be decreased, and on the other, the position of grinding wheels can be adjusted easily.

To achieve the above-mentioned purpose, the grinding mechanism, according to the present invention, comprises a rotating body, a first grinding wheel, a second grinding wheel, at least one first fastening means, at least one second fastening means, and a spacer assembly, wherein the spacer assembly is interposed between the first grinding wheel and the second grinding wheel.

According to the present invention, the first grinding wheel includes a first body portion and a first grinding portion; while the second grinding wheel includes a second body portion and a second grinding portion. The first and the second grinding portions have different diameters from each other, and are spaced from each other axially, and have different grinding precisions.

The at least one first fastening means passes through the first body portion and threadedly fastens into the rotating body so as to press and secure the first body portion against and on the rotating body. The at least one second fastening means passes through the second body portion and the spacer assembly, and threadedly fastens into the first body portion, so as to press and secure the second body portion and the spacer assembly against and on the first body portion of the first grinding wheel.

Through the above-mentioned structure, not only energy and facility cost can be saved by only using one single driving device to drive the two grinding wheels, but also a rough grinding and a fine grinding can be accomplished within a grinding process. Besides, adjustment on the spacing between the two grinding wheels is very easy.

The first grinding wheel may relate to a sand wheel, while the second grinding wheel to a brush wheel. In particular, such assembly can be employed in an occasion where a high grinding precision is required, for instance wafer grinding. Both the at least one first and second fastening means may relate to bolts.

Further, according to the present invention, the spacer assembly may consist of at least one elastic sheet, for instance rubber elastic sheet so as to facilitate a fine adjustment on the spacing between the two grinding wheels, and to absorb the stress incurred by the fastening means.

Still further, according to the present invention, the rotating body may internally be provided with a slurry channel for flowing of grinding slurry.

Other objects, advantages, and novel features of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view illustrating a conventional grinding machine with dual grinding wheels;

FIG. 2 is a cross-sectional view illustrating a grinding mechanism according to the present invention; and

FIG. 3 is an exploded view illustrating the grinding mechanism according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIGS. 2 and 3, cross-sectional and exploded views illustrating a grinding mechanism according to the present invention, the grinding mechanism comprises a rotating body 10, a first grinding wheel 13, a second grinding wheel 14, a spacer assembly 15, a plurality of first fastening means 31, and a plurality of second fastening means 32. According to the present invention, the rotating body 10 consists of a motor spindle 11 and a flange 12, wherein the flange 12 is threadedly engaged on an end of the motor spindle 11 by bolts 30 such that the flange 12 and the motor spindle 11 are coaxially arranged so as to rotate synchronously. The rotating body 10 is internally provided with a slurry channel 121 for flowing of grinding slurry.

According to the present invention, the first grinding wheel 13, relating to a cup-like sand wheel, includes a first body portion 131 and a first grinding portion 132 having abrasive grains where the first body portion 131 and the first grinding portion 132 are fixed together. The second grinding wheel 14, relating to a cup-like brush wheel, includes a second body portion 141 and a second grinding portion 142 having bristles where the second body portion 141 and the second grinding portion 142 are fixed together.

The first body portion 131 of the first grinding wheel 13 is threadedly fastened to an end surface of the flange 12 by the first fastening means 31 for instance bolts. The spacer assembly 15 consists of a plurality of spacers 151 made of the same or different materials. In the present invention, the spacer 151 relates to at least one resilient sheet, particularly rubber elastic sheet.

The second fastening means 32, for instance bolts, pass through both the second body portion 141 of the second grinding wheel 14 and the spacer assembly 15, and threadedly fasten into the first body portion 131 of the first grinding wheel 13 such that the second grinding wheel 14 and the spacer assembly 15 can be securely attached to the first grinding wheel 13.

According to the present invention, the first grinding wheel 13, which is a sand wheel, is employed for a rough grinding on workpieces; while the second grinding wheel 14, which is a brush wheel, is employed for a fine grinding on workpieces. In other words, the second grinding wheel 14 has a higher grinding precision. Further, since the first grinding wheel 13 has a diameter greater than that of the second grinding wheel 14, the first grinding portion 132 is farther away from an axis X of the rotating body 10 than the second grinding portion 142. The second grinding portion 142 extends, in an axial direction, further downward than the first grinding portion 132, and that a spacing h between them is determined in accordance with requirement in application. The spacing h refers to a distance between outmost end surfaces (free end surfaces) of the first grinding portion 132 and of the second grinding portion 142.

Through the above-mentioned structure, when the grinding mechanism performs a workpiece grinding, the outside-located first grinding portion 132 will be first employed to perform a rough grinding on a workpiece, then the second grinding portion 142 having bristles will follow for a fine grinding. Therefore, in a single grinding stroke, both steps of rough grinding and fine grinding can be accomplished. This will significantly save time and efforts, and besides, a more precise grinding outcome can be obtained.

When the grinding portions 132,142 are worn out and replacements are required, where the spacing h between the two grinding portions 132,142 needs to be readjusted or reset, the second fastening means 32 need to be removed first, and then the thickness of the spacer assembly 15 is altered by increasing or decreasing the number of the spacers 151. Accordingly, thickness of the spacers 151 determines as to how extent the spacing h is adjusted. That is to say, the thinner the spacers 151 are, the wider ranges of the adjustment are.

In particular, the resilient sheets (spacers 151) adopted in the present embodiment have some merits, namely, their elastic character not only facilitates a fine adjustment for the spacing h, but also absorbs the stress incurred by the fastening means 31,32.

Although the present invention has been explained in relation to its preferred embodiments, it is to be understood that many other possible modifications and variations can be made without departing from the scope of the invention as hereinafter claimed. 

1. A grinding mechanism, comprising: a rotating body; a first grinding wheel, including a first body portion and a first grinding portion; at least one first fastening means, passing through the first body portion and threadedly fastening into the rotating body so as to press and secure the first body portion against and on the rotating body; a second grinding wheel, including a second body portion and a second grinding portion, wherein the first and the second grinding portions have different diameters from each other, and are spaced from each other axially, and have different grinding precisions; a spacer assembly, being interposed between the first grinding wheel and the second grinding wheel; and at least one second fastening means, passing through the second body portion and the spacer assembly and threadedly fastening into the first body portion so as to press and secure the second body portion and the spacer assembly against and on the first body portion of the first grinding wheel.
 2. The grinding mechanism as claimed in claim 1, wherein the first grinding wheel relates to a sand wheel.
 3. The grinding mechanism as claimed in claim 2, wherein the second grinding wheel relates to a brush wheel.
 4. The grinding mechanism as claimed in claim 1, wherein the second grinding wheel relates to a brush wheel.
 5. The grinding mechanism as claimed in claim 1, wherein the spacer assembly consists of at least one elastic sheet.
 6. The grinding mechanism as claimed in claim 5, wherein the at least one elastic sheet is a rubber elastic sheet.
 7. The grinding mechanism as claimed in claim 1, wherein the at least one first fastening means relates to a bolt.
 8. The grinding mechanism as claimed in claim 1, wherein the at least one second fastening means relates to a bolt.
 9. The grinding mechanism as claimed in claim 1, wherein the rotating body is internally provided with a slurry channel for flowing of grinding slurry. 